fish-shell

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Remo Senekowitsch 88d01f7eb8 completions/cargo: avoid auto-installing toolchain via rustup

When cargo is installed via rustup, running cargo actually goes through
a proxy managed by rustup. This proxy determines the actual toolchain
to use, depending on environment variables, directory overrides etc. In
some cases, the proxy may automatically install the selected toolchain
if it's not yet installed, for example when first working on a project
that pins its rust toolchain via a `rust-toolchain.toml` file. In that
case, running cargo in the completion script can block the prompt for
a very long time. To avoid this, we instruct the rustup proxy not to
auto-install any toolchain with an environment variable.

Closes #12575

2026-03-27 20:11:22 +08:00